The new Doosan/Daewoo wheel loaders, DL300 and DL400, feature Tier-3-compliant diesel engines. The DL300 uses the Doosan DL08 engine and the DL400 uses the Cummins QSL9. Both six-cylinder engines feature electronic, high-pressure, common-rail fuel injection and charge-air cooling. The DL300 and DL400 use four-speed, powershift ZF transmissions that can be operated in an automatic mode. The implement hydraulic system for the DL300 employs a tandem vane pump with automatic wear compensation, and the system for the DL400 uses two load-sensing, variable-displacement axial-piston pumps. Both models incorporate hydraulically driven fans.